Britain's new leader Johnson vows to get Brexit done

Boris Johnson speaks after being announced as Britain's next Prime Minister at The Queen Elizabeth II centre in London, Britain July 23, 2019. [Reuters]

Boris Johnson, the Brexiteer who has promised to lead Britain out of the European Union with or without a deal by the end of October, will replace Theresa May as prime minister after winning the leadership of the Conservative Party on Tuesday.

His convincing victory catapults the United Kingdom towards a showdown with the EU and towards a constitutional crisis at home, as British lawmakers have vowed to bring down any government that tries to leave the bloc without a divorce deal.